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We can use Fitt’s Law?

It’s not everyday I recognize something from the Human Factors courses I slept through: mezzoblue § Fitts’ Law. Now, if only we can make use of Therbligs to analyze motions during user interaction…

A larger clickable area means less precise mouse movement is required to focus on the link. Without impacting the design in any way (the halo is non-visible after all) the usability of the header improves.